import { isDef, isNumber, isPlainObject, isPromise } from './validator'
import { canIUseGroupSetData, canIUseNextTick } from './version'
export function range (num, min, max) {
  return Math.min(Math.max(num, min), max)
}
export function nextTick (cb) {
  if (canIUseNextTick()) {
    wx.nextTick(cb)
  } else {
    setTimeout(() => {
      cb()
    }, 1000 / 30)
  }
}
let systemInfo
export function getSystemInfoSync () {
  if (systemInfo == null) {
    systemInfo = wx.getSystemInfoSync()
  }
  return systemInfo
}
export function addUnit (value) {
  if (!isDef(value)) {
    return undefined
  }
  value = String(value)
  return isNumber(value) ? `${value}px` : value
}
export function requestAnimationFrame (cb) {
  const systemInfo = getSystemInfoSync()
  if (systemInfo.platform === 'devtools') {
    return setTimeout(() => {
      cb()
    }, 1000 / 30)
  }
  return wx
    .createSelectorQuery()
    .selectViewport()
    .boundingClientRect()
    .exec(() => {
      cb()
    })
}
export function pickExclude (obj, keys) {
  if (!isPlainObject(obj)) {
    return {}
  }
  return Object.keys(obj).reduce((prev, key) => {
    if (!keys.includes(key)) {
      prev[key] = obj[key]
    }
    return prev
  }, {})
}
export function getRect (context, selector) {
  return new Promise((resolve) => {
    wx.createSelectorQuery()
      .in(context)
      .select(selector)
      .boundingClientRect()
      .exec((rect = []) => resolve(rect[0]))
  })
}
export function getAllRect (context, selector) {
  return new Promise((resolve) => {
    wx.createSelectorQuery()
      .in(context)
      .selectAll(selector)
      .boundingClientRect()
      .exec((rect = []) => resolve(rect[0]))
  })
}
export function groupSetData (context, cb) {
  if (canIUseGroupSetData()) {
    context.groupSetData(cb)
  } else {
    cb()
  }
}
export function toPromise (promiseLike) {
  if (isPromise(promiseLike)) {
    return promiseLike
  }
  return Promise.resolve(promiseLike)
}
export function getCurrentPage () {
  // eslint-disable-next-line no-undef
  const pages = getCurrentPages()
  return pages[pages.length - 1]
}
